The invention discloses a method for building a tunnel project geologic longitudinal profile map. The method includes the steps that a tunnel line, a tunnel roof line, a tunnel ground line, geophysical prospecting data and drilling data information are obtained, and a tunnel geologic longitudinal profile template is created according to tunnel line mileage and elevation information; on the basis of the tunnel geologic longitudinal profile template, tunnel project geologic information is subjected to interpretation processing to obtain a tunnel project geologic information interpretation map, wherein interpretation processing includes the steps of geological boundary interpretation, fault interpretation, wrinkle interpretation, stratum interpretation and rock mass classification interpretation; on the basis of the tunnel project geologic information interpretation map and according to tunnel geologic structure information, the tunnel project geologic longitudinal profile map is built. By means of the method, geological designers automatically design tunnel geologic longitudinal profile maps of railways and the like by means of computer software on the basis of railway lines, ground lines, roof lines and other geologic data, and the work efficiency of design of the tunnel geologic longitudinal profile maps of the railways and the like is effectively improved.